Ablation Characteristics of Contact Wires in the Pantograph–Catenary System under Successive Arcing Events
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Submission ID：85 View Protection：ATTENDEE
Updated Time：2025-11-03 11:27:26
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Poster Presentation
Start Time：2025-11-09 09:05 （Asia/Shanghai）
Duration：1min
Session：[P] Poster presentation » [P7] 7.Electric Machine Design and Control
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Abstract
Offline arc is a characteristic phenomenon in the dynamic interaction of the pantograph–catenary (PC) system, and its repeated occurrence leads to pronounced ablation of the contact wire surface. This significantly compromises current collection stability and shortens the service life of the PC system. Unlike previous studies that mainly focused on a single separation event, this work investigates the ablation characteristics of the contact wire under successive dynamic separations. First, a finite element–based dynamic model of the PC system was established using a three-mass model to capture the trajectories of multiple separation events between the slide and the contact wire. Then, a multi-physics coupled model of arc discharge was developed based on magnetohydrodynamic theory. Considering latent heat exchange during material phase transitions, an ablation model of the contact wire was further constructed using the apparent heat capacity method. Finally, based on a simulation platform, the effects of different separation stages and current intensities on contact wire ablation under successive dynamic separations were analyzed. The results indicate that compared with a single separation event, three successive separations increase the ablation area from 0.18 mm² to 5.89 mm². Moreover, higher current intensities further aggravate ablation severity. In addition, due to cumulative arc heating effects, the third stage of successive separations becomes the dominant interval contributing to material damage of the contact wire.
Keywords
Pantograph–Catenary System, Contact Wire, Successive Dynamic Separations, Transient Arcing, Ablation Characteristics
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